Update, 6:10 p.m. ET: Hurley tells Roll Call's Eliza Newlin Carney that Leaders for Families is likely to close up shop now that Santorum's campaign has moved past Iowa. The Iowa-based group has done what it was created to do and the founders don't have much influence outside their home state, he reasons.

Leaders for Families lists James Bopp Jr. as its custodian of records; the Terre Haute, Ind.-based attorney represented Citizens United in its landmark Supreme Court victory against the Federal Election Commission that opened the door to unlimited spending by individuals, corporations and labor unions to influence elections. Bopp also formed the Republican Super PAC, which declared it would coordinate fundraising--but not spending--with federal candidates and party officials. The FEC approved such coordination on June 30.